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Adam Sagan
Cracow University of Economics, Cracow, Poland
Justyna Brzezińska
University of Economics in Katowice, Katowice, Poland
Mirosława Sztemberg-Lewandowska
Wroclaw University of Economics and Business, Wroclaw, Poland
Marcin Pełka
Wroclaw University of Economics and Business, Wroclaw, Poland